Low lithium, low thermal expansion high recycled content glasses

Abstract

A glass comprising a coefficient of thermal expansion (CTE) of 70×10 −7 /° C. or less, a liquidus viscosity of at least 150 kP, and Li 2 O in an amount of 0.1 wt. % or less, wherein the glass is ion-exchangeable. A glass, comprising SiO 2 in an amount of 64-73 wt. %, Al 2 O 3 in an amount of 7-15 wt. %, B 2 O 3 in an amount of 9-11 wt. %, Na 2 O in an amount of 6-9.5 wt. %, K 2 O in an amount of 0.5-3 wt. %, CaO in an amount of at least 0.05 wt. %, and Li 2 O in an amount of less than 0.1 wt. %, wherein a weight ratio of Na 2 O/Al 2 O 3 is less than or equal to 0.9. A method of recycling glass, the method comprising heating a composition to form a melt, the composition comprising glass cullet in an amount of at least 60 wt. %, and raw materials in an amount of 40 wt. % or less.

What is claimed is: 
     
         1 . A glass, comprising:
 SiO 2  in an amount of 64-73 wt. %;   Al 2 O 3  in an amount of 7-15 wt. %;   B 2 O 3  in an amount of 9-11 wt. %;   Na 2 O in an amount of 6-9.5 wt. %;   K 2 O in an amount of 0.5-3 wt. %; and   CaO in an amount of at least 0.05 wt. %;   Li 2 O in an amount of 0.1 wt. % or less;   wherein a weight ratio of Na 2 O/Al 2 O 3  is less than or equal to 0.9.   
     
     
         2 . The glass of  claim 1 , comprising:
 SiO 2  in an amount of 66-72 wt. %;   Al 2 O 3  in an amount of 8-14 wt. %;   Na 2 O in an amount of 6.5-9 wt. %;   K 2 O in an amount of 1-2.5 wt. %; and   CaO in an amount of 0.1-5 wt. %;   
     
     
         3 . The glass of  claim 1 , comprising:
 CaO in an amount of 0.1-2 wt. % MgO in an amount of 0-1 wt. %; and   SnO 2  in an amount of 0-1 wt. %.   
     
     
         4 . The glass of  claim 1 , comprising at least one of:
 a coefficient of thermal expansion (CTE) of 70×10 −7 /° C. or less; and   a liquidus viscosity of at least 150 kP.   
     
     
         5 . The glass of  claim 1 , wherein the Young's modulus is at least 60 GPa. 
     
     
         6 . The glass of  claim 1 , wherein the CTE is at least 44×10 −7 /° C. 
     
     
         7 . The glass of  claim 1 , comprising a 200 P temperature of 1800° C. or less. 
     
     
         8 . The glass of  claim 1 , comprising a 35,000 P temperature of at least 1000° C. 
     
     
         9 . The glass of  claim 1 , comprising a strain point of at least 525° C. 
     
     
         10 . The glass of  claim 1 , comprising a liquidus temperature of 1000° C. or less. 
     
     
         11 . The glass of  claim 1 , comprising a liquidus viscosity of 18,000 kP or less. 
     
     
         12 . The glass of  claim 1 , wherein, when the glass has a thickness of 1 mm and is subjected to a single step ion exchange in a 100 wt. % KNO 3  molten salt bath at 430-450° C., the glass achieves a maximum compressive stress of 300-600 MPa and a depth of layer (DOL) of at least 8 μm within 1 hour. 
     
     
         13 . The glass of  claim 1 , wherein the glass is substantially free of Li 2 O. 
     
     
         14 . A method of chemically strengthening a glass-based substrate, the method comprising:
 ion exchanging the glass-based substrate in a molten salt bath to form a glass-based article;   wherein the glass-based article comprises:
 a maximum compressive stress (CS) of 300-600 MPa; and 
 a depth of layer (DOL) of 5-30 μm; 
   wherein the glass-based substrate comprises the glass of  claim 1 .   
     
     
         15 . The method of  claim 14 , wherein the ion-exchanging takes place for 2 hours or less. 
     
     
         16 . The method of  claim 14 , wherein the molten salt bath comprises at least 95 wt. % KNO 3  and a temperature of at least 400° C. 
     
     
         17 . A glass-based article, comprising:
 a maximum compressive stress (CS) of 300-600 MPa;   a depth of layer (DOL) of 5-30 μm; and   a composition at a center of the glass-based article;   wherein the composition at the center of the glass-based article comprises the glass of  claim 1 .   
     
     
         18 . A consumer electronic device comprising:
 a housing having a front surface, a back surface, and side surface;   electrical components provided at least partially within the housing, the electrical components including at least a controller, a memory, and a display, the display being provided at or adjacent to a front surface of the housing; and   a cover glass disposed over the display,   wherein at least one of a portion of the housing or the cover glass comprises the glass-based article of claim  17 .   
     
     
         19 . A method of recycling glass, the method comprising:
 heating a composition to form a melt, the composition comprising:
 glass cullet in an amount of at least 60 wt. %; and 
 raw materials in an amount of 40 wt. % or less; 
 based on total weight of the composition; 
   wherein, when the melt is formed and cooled to form a glass-based substrate, the glass-based substrate is the glass of  claim 1 .   
     
     
         20 . A composition, comprising:
 glass cullet in an amount of at least 60 wt. %; and   raw materials in an amount of 40 wt. % or less;   based on total weight of the composition   wherein the glass cullet comprises:
 SiO 2  in an amount of 65-80 wt. %; 
 Al 2 O 3  in an amount of 1-10 wt. %; 
 B 2 O 3  in an amount of 5-15 wt. %; 
 Na 2 O in an amount of 1-10 wt. %; 
 K 2 O in an amount of 0.1-5; 
 CaO in an amount of 0.05-10 wt. %; and 
 Li 2 O in an amount of less than 0.1 wt. %; 
 based on total weight of glass cullet; and 
   wherein the raw materials comprise at least one of:
 SiO 2 ; 
 Na 2 CO 3 ; and 
 Al 2 O 3 .